<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    html,body{
      height: 100%;
      width: 100%;
      padding: 0;
      margin: 0;
    }
    body{

      display: flex;
      flex-direction:column;
    }
    .test{
      background-color: #00B7FF;
      flex:0 0 200px;
    }

    .xia{
      background-color: #5e5e5e;
      flex: 1;
      display: flex;
    }

    .left{
      background-color:yellow;
      flex: 0 0 200px;
    }
    .right{
      background-color: #2b542c;
      flex: 1
    }
  </style>
</head>
<body>
<div class="test">ww</div>
<div class="xia">
  <div class="left">zuobiande</div>
  <div class="right">zuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuob
    iandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiand
    ezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobian
    dezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezu
    obiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiandezuobiande</div>
</div>
</body>
</html>
